reducing

This problem occurs at speed (above 50 mph). While trying to maintain speed on a down hill section of the hi-way, I reduce throttle pressure and the car experiences a mild bucking. The problem goes away if the throttle pressure is removed (take foot off gas). This problem occurs in moth...

This is to supplement the discussions on reflashing the ECU. At wide open throttle the motor defaults to open loop and dumps in all the fuel it can resulting in an over rich mixture of around 11:1 or less. Ideal is about 12.8-13:1. Stock fuel pressure is regulated at 55 PSI. Reducing this fuel...